The guy working today at the till was extremely unprofessional and had a foul attitude

The guy working today at the till was extremely unprofessional and had a foul attitude. When asking him to redeem my lotto ticket he attempted and it didn't work he I then asked him if there is a serial code he can manually input and he immediately that it's a long process and said that if it doesn't work on the first time he won't try again. Before giving him the serial code he said I don't know why you trying this because its not going to win. I felt very unwelcomed and won't recommend this shop as the service received was puterate. The shop had no customers at the time and I was patient to let him help the other customers. I have been supporting this local business all my life and to receive this type of treatment really upsets me.